Improvement in screw-wrenches



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/2/ @faim UNITED STATES PATENT OEEICEO H. DODGE, OF SAME PLAGE.

IMPROVEMENT IN SCREW-WRENCHES.

Specification forming part of Letters Patent No. 55,739, dated June 19, 1f`66.

To all whom t 'may concern:

Be it known that I, GEORGE O.TAF1,ot` the city and county of VVoreester, and State ot' Massachusetts, have invented certain new and useful Improvements in Wrenches; and I do hereby declare that the following is a full, clear. and exact description of the same, reference being had to the accom panying drawings, forming a part of this specification, in which- Figure 1 represents a side view of my improved wrench; and Fig. 2 represents a longitudinal central section on u,line A B, Fig. l looking in the direction of arrow l.

In the drawings, A represents the stationary ,jaw connected with the bar B and shank (l, the latter receiving the handle in the usual manner.

D represents the movable jaw, which works upon the bar B.

E represents the cylinder-nut, by which the jaw D is operated by means ot' the female screwthread a. of nut E taking into the male screw thread b on the bar B.

The rear part F otjaw D is turned or cast so as to leave a shoulder, c, against which the the front of nut E hears when the wrench is used.

The front part of nut E is cored out, as seen at d, but a flange, e, is left about n'iidway. The front of the flange is beveled ott', as seen atl, while the rear part has a perpendicular' edge, as seen at 2.

A stirrup, f, projects back from jaw D, and is sprung past the flange e on nut E, so that when jaw D and nut E are arranged in position upon bar B, as shown in the drawings, they are se curely looked together, whereby, as nut E is turned back, it will withdraw jaw D, while when nut E is turned forward it bears against shoulder c and forcesjaw D forward.

It will be observed that stirrupfis subject to but little strain in withdrawing the movablejaw, and none when the wrench is used to turn a nut, the ,jaws heilig' held iu place, its shoulder c bearing against the i'ront ot' nut E.

The rear end, g, ot' stirrnp j' may be beveled on both edges, it' desired, only one edge, 3, heilig shown beveled in thcdrawings.

I have shown but one stirrup, but two or more may be used, if desired, although onel answers a good purpose lor the smaller-sized wrenches.

Havingdescribed my improved wrench, what I claim therein as new, and desire to secure by Letters Patent, is-

1. The combination, with nut E, havinga Ilange, c, of the jaw l) and its stirrupj', substantially as set t'orth.

2. The combination, with thefrontot' nutE, ot' the shoulder c on jaw D, as and for the purposes set forth.

Beveling olf the front of llange e, in combination with bevelingoff the rear ot' stirrup f, as seen at 3 in the accompanying drawings.

GEO. O. TAFT.

Witnesses H. L. FULLER, Trios. H. DODGE. 

